Zooplankton Community and their variation : A case study in Few rivers Across Nadia and North 24 Parganas, West Bengal

This study conducted to investigate the plankton diversity and abundance from the rivers at Nadia and North 24 Parganas to reveal the status. Samples were collected from seven sites of rivers Hooghly, Churni, Jalangi, Mathabhanga Bhagirathi, Ichamathi of West Bengal were carried out during March to May 2021. Enormous loads of wastes received from anthropogenic activities influences the living planktonic organisms which play the major role in food web dynamics in riverine ecosystem. pH, temperature, dissolved oxygen, dissolved carbon di-oxide, transparency, hardness, alkalinity, total dissolved solids, nitrate, nitrite, silicate and ammonia were analysed. 21 speciesof zooplankton including protozoa (2 species, 2 genera, 2 families, 1 order), rotifers (11 species, 6 genera, 4 families, 2 suborders), copepods (2 species, 2 genera, 2 families, 1 suborder), and Cladocera (5 species, 5 genera, 4 families, 1 suborder) and the variation in abundance were noticed from the study. The maximum representation of the zooplankton species belonging to rotifera (Family: Brachionidae) and copepodites and naupliar stages of cyclopoid copepods were found to be abundant.